This repository provides a structured and detailed guide on using Flask-SQLAlchemy to manage models and interact with databases in Flask applications. The goal is to share knowledge about different attributes, column options, and best practices.

flask-sqlalchemy-guide/ ├── README.md # Project overview and introduction ├── setup/ # Environment setup instructions │ └── environment.md ├── models/ # Guides on defining models │ ├── basic-models.md # Basic model creation │ ├── column-attributes.md # Column options and attributes │ ├── relationships.md # Defining relationships (One-to-Many, Many-to-Many) │ └── validations.md # Model constraints and validation ├── database/ # Database creation and management │ ├── creating-tables.md # How to create tables │ └── migrations.md # Database migrations with Flask-Migrate └── examples/ # Practical examples and best practices ├── simple-app/ # Simple Flask app with SQLAlchemy └── advanced-features/ # Advanced configurations 

Instructions to set up the environment:

• Installing Flask-SQLAlchemy
• Creating a virtual environment
• Connecting to different databases

Example Configuration:

from flask import Flask from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db' app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False db = SQLAlchemy(app)

Basic structure of defining models and mapping them to tables.

Example:

class User(db.Model): id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(80), nullable=False) email = db.Column(db.String(120), unique=True, nullable=False)

Comprehensive list of column attributes:

• Data Types: db.Integer, db.String, db.Float, db.Boolean, etc.
• Common Options:
  • primary_key=True
  • nullable=False
  • unique=True
  • default=value

Example:

price = db.Column(db.Float, default=0.0, nullable=False) created_at = db.Column(db.DateTime, default=db.func.now())

Guide on creating relationships between tables:

• One-to-Many
• Many-to-Many

Example:

class Post(db.Model): id = db.Column(db.Integer, primary_key=True) user_id = db.Column(db.Integer, db.ForeignKey('user.id')) user = db.relationship('User', backref='posts')

How to apply model-level constraints and validation.

Steps to create tables and manage the database lifecycle.

Creating Tables:

with app.app_context(): db.create_all()

How to handle migrations using Flask-Migrate.

A minimal example of a Flask app with a User model.

Examples demonstrating advanced configurations such as:

• Custom Query Methods
• Database Indexing
• Performance Optimization

Feel free to open issues or submit pull requests to improve this guide.

MIT License